@charset "UTF-8";

body {
  background: #fff;
  text-align: center;
  min-width: 640px;
}
header {
  max-width: 1366px;
  margin: 0 auto;
  padding: 15px 0;
  text-align: left;
}
header img {
  width: auto;
  height: 65px;
}
header nav {
  float: right;
}
header li {
  float: left;
  padding: 0 35px;
  line-height: 65px;
}
header li a{
  font-size: 18px;
  color: #333;
}

.wrap {
  max-width: 1366px;
  margin: 0 auto;
  position: relative;
}
.pos {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
}
.title {
  font-size: 24px;
  color: #fff;
  font-weight: 400;
  display: inline-block;
  position: relative;
}
.title::before,
.title::after {
  content: '/';
  position: absolute;
  color: #fff;
  font-size: 30px;
  left: -45px;
  top: -5px;
  transform: rotate(20deg)
}
.title::after {
  left: auto;
  right: -45px;
}

.bg1 {
  margin-bottom: 20px;
}
.bg1 .pos {
  height: auto;
  top: 50%;
  transform: translateY(-50%);
}
.bg1 h1 {
  color: #fff;
  font-size: 60px;
}
.bg1 p {
  margin: 5px 0;
  color: #fff;
  font-size: 20px;
  line-height: 1.6;
}
.bg1 a,
.demo .more {
  border-radius: 25px;
  background: #0099ff;
  color: #fff;
  padding: 10px 30px;
  display: inline-block;
}

.bg2 {
  max-width: 100%;
}
.bg2 .title {
  top: 50%;
  margin-top: -50%;
}

.content p {
  color: #333;
  font-size: 24px;
  line-height: 1.8;
  margin: 50px auto 100px;
}

.bg3 {
  display: inline-block;
}
.bg3 .title {
  color: #333;
}
.bg3 .title::before,
.bg3 .title::after {
  color: #333;
}
.bg3 li {
  float: left;
  width: 33.33%;
  position: relative;
}
.bg3 .pos {
  height: auto;
  bottom: 0;
  top: auto;
}
.bg3 .pos h3 {
  color: #fff;
  font-size: 32px;
  text-align: left;
  margin: 0 0 10px 30px;
  font-weight: 400;
}
.bg3 .pos span {
  display: block;
  color: #fff;
  font-size: 16px;
  text-align: left;
  margin: 0 0 30px 30px;
}
.bg3 .pos a {
  display: none;
  float: left;
  background: #fff;
  padding: 10px 30px;
  color: #333;
  margin: 0px 0 20px 30px;
}
.bg3 .mask {
  display: none;
}
.bg3 .active .mask {
  display: block;
}
.mask {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  background: rgba(0,0,0,0.5)
}
.bg3 .active .pos {
  bottom: 25%;
}
.bg3 .active .pos a{
  display: block;
}

.demo {

}
.demo .title {
  margin: 30px 0;
  color: #333;
}
.demo .title::before,
.demo .title::after {
  color: #333;
}
.demo li {
  float: left;
  width: 32%;
  margin-right: 2%;
}
.demo li:nth-child(3n) {
  margin-right: 0;
}
.demo li .main{
  position: relative;
}
.demo li .pos{
  display: none;
  background: rgba(0,0,0,0.5);
}
.demo li.active .pos{
  display: block;
}
.demo .pos a {
  background: #fff;
  padding: 10px 40px;
  color: #333;
  margin-top: -50%;
  font-size: 18px;
  color: #333;
  position: relative;
  top: 50%;
}
.demo li span {
  display: inline-block;
  margin: 15px 0 25px 0;
  font-size: 18px;
}
.demo .more {
  margin-top: 20px;
  margin-bottom: 30px;
}

.bg4 {
  max-width: 100%;
}
.bg4 .mask {
  background: rgba(0,0,0,0.5);
}
.bg4 .pos {
  height: auto;
  top: 50%;
  transform: translateY(-50%)
}
.bg4 .logo {
  width: 170px;
  margin-bottom: 20px;
}
.bg4 span,
.bg4 a {
  display: block;
  font-weight: 400;
  font-size: 20px;
  color: #fff;
  margin: 5px 0;
}